Description of business and significant accounting policies and practices (Tables)

12 Months Ended

Dec. 31, 2011

Description of business and significant accounting policies and practices [Abstract]

Computation and reconciliation of earnings per common share

Computation and reconciliation of earnings per common share are as follows (shares in millions):

	2011						2010						2009
	Net Income			Shares	EPS		Net Income			Shares	EPS		Net Income			Shares	EPS
Basic EPS:
Net income	$	2,236					$	3,228					$	1,470
Less income allocated to RSUs	(35		)				(44		)				(14		)
Income allocated to common stock for basic EPS calculation	$	2,201		1,151	$	1.91	$	3,184		1,199	$	2.66	$	1,456		1,260	$	1.16
Adjustment for dilutive shares:
Stock-based compensation plans				20						14						9
Diluted EPS:
Net income	$	2,236					$	3,228					$	1,470
Less income allocated to RSUs	(34		)				(44		)				(14		)
Income allocated to common stock for diluted EPS calculation	$	2,202		1,171	$	1.88	$	3,184		1,213	$	2.62	$	1,456		1,269	$	1.15